/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.optimizer.parse.visitor;

import com.alibaba.polardbx.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.polardbx.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor;
import com.alibaba.polardbx.optimizer.parse.util.SpParameter;
import org.apache.calcite.util.Pair;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class DrdsSpParameterizeSqlVisitor extends MySqlOutputVisitor {

    List<Pair<String, SpParameter>> spParameters = new ArrayList<>();
    final Map<String, SpParameter> spVariables;

    public DrdsSpParameterizeSqlVisitor(Appendable appender, boolean parameterize,
                                        Map<String, SpParameter> spVariables) {
        super(appender, parameterize);
        this.spVariables = spVariables;
    }

    @Override
    public boolean visit(SQLIdentifierExpr x) {
        if (spVariables.containsKey(x.getSimpleName())) {
            print('?');
            spParameters.add(Pair.of(x.getSimpleName(), spVariables.get(x.getSimpleName())));
            return false;
        } else {
            return super.visit(x);
        }
    }

    public List<Pair<String, SpParameter>> getSpParameters() {
        return spParameters;
    }
}